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    <title>Document</title>
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    <h4>注释标签</h4>
    <!-- 我想发财 -->
    <h4>特殊符号</h4>
    空&nbsp;&nbsp;格<br />
    &lt;<br />
    &gt;<br />
    &amp;<br />
    &yen;<br />
    &copy;<br />
    &reg;<br />
    &deg;<br />
    &plusmn;<br />
    &times;<br />
    &divide;<br />
    &sup2;<br />
    &sup3;<br />
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